This is a specialty  of dentistry that focuses on alignment of the teeth and jaws to improve a person’s smile and oral health. Orthodontists will diagnose, treat and prevent irregularities of the teeth with the use of braces, which are fixed dental appliances, and removable dental appliances, when the braces are removed. These devices can be used to straighten teeth, correct an irregular bite, close unsightly gaps and bring teeth and lips into proper alignment. Crooked teeth that do not fit together correctly are harder to keep clean and are at risk of beinglost early because of tooth decay or periodontal disease.